Brake Pedal Signal Cross-Check for Transmission Path Reliability
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Solution Overview
Problem
Conventional hydraulic braking systems face challenges in ensuring operational reliability due to potential play or air in the transmission path between the brake pedal and hydraulic unit, which can lead to incorrect signal generation and reduced braking system reliability.
Innovation Solution
A method that utilizes a brake light switch and a sensor, such as a pedal travel sensor, to evaluate the integrity of the transmission path by comparing switch signals and sensor signals to determine the driver's braking intent, generating an error signal if the signals do not align, thereby identifying and addressing excessive play or air in the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical transmission path is used between the brake pedal and hydraulic unit, then the braking system can generate brake pressure through direct mechanical actuation, but play or air in the transmission path can cause signal errors and reduce operational reliability
Solution Approach 1:
The patent employs feedback by continuously monitoring the transmission path integrity through comparison of brake light switch signals with sensor signals from the hydraulic unit. When discrepancies are detected (indicating play or air in the transmission path), the system generates error signals and can activate warning indicators, providing real-time feedback on system reliability without requiring complex structural changes to the mechanical transmission path itself.
2Speed
If the brake light switch is positioned adjacent to the brake pedal for immediate signal generation, then the switch signal is generated promptly upon pedal actuation, but this configuration cannot detect play in the transmission path between the pedal and hydraulic unit
Solution Approach 1:
The patent introduces an intermediary monitoring system that compares two independent signals: the brake light switch signal (providing immediate response) and the sensor signal from the hydraulic unit (providing transmission path verification). This intermediary comparison mechanism allows the system to maintain fast signal generation while simultaneously detecting transmission path anomalies through signal correlation analysis.
3Measurement precision
If multiple sensors and signal comparison mechanisms are added to monitor transmission path integrity, then the detection accuracy of play or air in the system is improved, but the device complexity increases
Solution Approach 1:
The monitoring system performs self-service by utilizing existing system components (brake light switch and hydraulic unit sensors) and comparing their signals against each other. This self-diagnostic approach eliminates the need for additional dedicated sensors or complex monitoring hardware, achieving high detection accuracy through intelligent signal correlation rather than through component proliferation.
Data Source
AI summary
In a method for monitoring the operational reliability of a braking system in a vehicle. A brake pedal actuation is monitored via a brake light switch. An error signal is generated if the brake light switch generates a switch signal, without a braking intent of the driver being registered via a sensor signal of a sensor.